If your printout has letters (or other symbols) in place of icons, your printer may not have enough memory. Other than increasing the amount of RAM in your printer, you can try reducing the memory requirements of your printer by:
Ø Turning on Print Icons as Polygons in the Options | Settings dialog.

Ø Printing your map on a smaller part of the page (select a larger region in the print dialog).

Ø Using fewer complex fonts.

Ø Turn off the background square, hex, or triangle grid.

Ø Convert a group of similarly (but different sized) icons to use the same size.